[matheusmoreira]

It already exists. If the user agent sends a Do-Not-Track header, the HTTP server will know the user has made their lack of consent explicit. This knowledge is available before the web application even gets control. There are no excuses and no ambiguities.

All courts have to do is request server logs and look for this header. If it's present and the company is found to be violating people's privacy, they are obviously guilty and should be condemned and fined.

[kevsim]

Even the browser vendors have given up on do-not-track though. Apple even removed support for it from Safari.

[matheusmoreira]

Indeed. Not only is it useless for its intended purpose but it also adds an additional bit of data to track users with. Everything would've been different if it could be enforced by law.